Quote:
Originally Posted by AlexR
The thing is though, with the rubber seal there it's directing the air down the back of the engine bay, with lifters more air is entering meaning that there is more air in the engine bay that needs to escape.
Aerodynamics is pretty simple really. Imagine a wedge shaped piece of metal, flat and level at the bottom, the top side is angled. The bottom has negligible aero in isolation, the top part will create downforce as it needs to compress the air for the air to pass over it, putting pressure on the top side, obviously the further back you go the more pressure is created so the extra pressure is higher the further along the wedge you go. As the wedge finishes there is now an area behind it that is vacant space, for the air to fill that it would have to expand again, this creates a low pressure zone as opposed to the high pressure zone where air is compressing. The air will flow into this zone, imagine this is now the shape of your bonnet(sloped with a drop off at the end) The air fill flow into the gap.
Inside the engine bay the air loses most of it's speed passing through the rad and around the engine, and the majority flows under the engine & gearbox but some goes around the sides and over, very little but some. With bonnet lifters most of the air will be sucked in when moving and have nowhere to go, it will try and lift the bonnet further creating lift.
Rear splitters are usually designed to create a low pressure zone under the rear of the car by providing a tuned shape to channel the air and create downforce. Just like a front splitter(or wing like in F1) is always sloped to compress air and provide additional downforce. The larger the angle the more downforce.
Just think logically on the basic rules and you can predict the effect of anything.
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Bosh - hole in one! I does make sense now - I don't think it'll make a huge difference on the road? And in terms of acceleration?
Apologies is derailed the prog thread